[Solved] Building Qt 4.8.0 on windows7 64 Bit with VS2010

I recently downloaded the Qt 4.8.0. I have windows7 64 bit OS with VS2010.
I wanted to build this version of Qt.
But when I checked the mkspecs folder it only had win32-msvc2010, but there was no win64-msvc2010.
Thus, What argument do I need to pass to the command "configure -platform" so as to get 64 Bit Qt build ?

But QT itself is not configured properly to change for x64.
I've seen tons of warnings size_t to int conversion data loss.
And even though in static Qt was built OK but the whole application that was working ok in win32 failes after launch.